GCSE Chemistry C2

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ghoran
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143418
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GCSE Chemistry C2
Updated:
2012-03-24 06:24:48
Tags:
unit two part one structure bonding covalent
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  1. (general) non metals react together by ... .... . when two atoms .... a pair of ..... they form a covalent bond . covalent bonds are .... .... . Any element or compound that is formed by atoms .... .... is called ......
    • sharing electrons
    • share
    • electrons
    • very strong
    • sharing electrons
    • molecular
  2. (general) there are two types of covalent bonding these include
    • simple molecular or sometimes known as simple covalent
    • ginat covalent
  3. Many of the elements and compounds exist as small molecules and so we call thier structure
    simple molecular
  4. examples of compounds or elements that have a simple molecular structure include :
    • hydrogen
    • chlorine
    • water
    • ammonia
    • hydorgen chloride
    • methane
    • oxygen
  5. simple molecular - substances which are made of small molecules have relatively ... melting and boiling points this is because the ... of ..... ..... the molecules are very .... and so ... very much .... is needed to break them . we say these substances have .... ..... ... . it is is these ...... ........ ... that need to be overcome when these substances change state not the ...... ...... ... ...... the molecule
    • low
    • forces of attraction
    • between
    • weak
    • not
    • energy
    • weak intermolecular forces
    • weak intermolecular forces
    • strong covalent bonds within
  6. elements and compounds with a simple molecular structure do ... conduct electricity . this is because :
    (simple molecular)
    • not
    • the molecules are not charged (like ions are) and do not have any free moving electrons (like metals do)
  7. most molecular substances are ..... and ..... at room temperature but they can be ....
    (simple molecular)
    • gases
    • liquids
    • solid
  8. draw the structure of hydrogen
    (simple molecular)
    • or
    • H-H
    • or
  9. draw the structure of chlorine
    (simple molecular)
  10. draw the structure of water
    (simple molecular)
  11. draw the stucture of ammonia
    (simple molecular )
  12. draw the structure of hydrogen chloride
    (simple molecular)
  13. draw the structure of methane
    (simple molecular)
  14. draw the chemical structure for oxygen
    (simple molecular)
  15. fill in this table (simple molecular)
  16. giant covalent structures are known as
    macramolecules
  17. giant covalent - in ginat covalent structures all the atoms are bonded to each other by ..... ... ...
    strong covalent bonds
  18. giant covalent - giant covalent structures have very ..... melting and boiling points this is because :
    • high
    • a lot of heat energy is needed to break the many very strong covalent bonds between the atoms
  19. ginat covalent - ginat covalent structures .... conduct electricity this is because :
    • dont (not even when moleten)
    • there are no charged particles or free electrons
  20. ginat covalent - the main examples of macramolecules are
    • diamond
    • graphite
    • silica
  21. ginat covalent
    in diamond each each carbon atomd forms .... covalent bonds in a very ..... ginat covalent structure . this structure makes diamond the .... natural substance so it's used for drill tips , and it's pretty sparkly to
    • 4
    • rigid
    • hardest
  22. ginat covalent - both diamond and graphit are only made up of ..... atoms
    carbon
  23. ginat covalent - silica is also known as ..... ... , this is what ..... is made of . Each grain of .... is one .... .... of ..... and ....
    • silicon dioxide
    • sand
    • sand
    • giant structure
    • silicon
    • oxygen
  24. ginat covalent - in graphite each carbon atom only forms .... covalent bonds . This means that each carbon atom has ... .... that is not involved in a covalent bond and it is these .... ... ..... which can move and so enable graphite to ..... electricity each carbon atom forms .... which are ..... to .... .... .... ... , like a pack of cards - so graphite is .... and ..... .
    • 3
    • one electron
    • free delocalised electrons
    • conduct
    • layers
    • free
    • slide over each other
    • soft
    • slippery

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